<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>简易邮件管理系统</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: Arial, sans-serif;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background: url('/static/background.jpg') no-repeat center center fixed;
            background-size: cover;
        }
        .container {
            text-align: center;
            background-color: rgba(255, 255, 255, 0.9);
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 30px;
        }
        .button {
            display: inline-block;
            margin: 10px;
            padding: 15px 40px;
            font-size: 18px;
            text-decoration: none;
            color: white;
            background-color: #007bff;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
            transition: background-color 0.3s, box-shadow 0.3s;
        }
        .button:hover {
            background-color: #0056b3;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>简易邮件管理系统</h1>
        <!-- 登录按钮 -->
        <a href="{{ url_for('main.login') }}" class="button">开始使用</a>
    </div>
</body>
</html>
